http://www.johnjasonfallows.com/2017/11/30/when-tweets-are-governmental-business-officials-dont-get-to-pick-and-choose-who-gets-to-receive-comment-on-and-reply-to-them-that-goes-for-the-president-too-2/
When Tweets Are Governmental Business, Officials Don't Get to Pick and Choose Who Gets To Receive, Comment On, And Reply to Them. That Goes For the President, Too